Switching system and translator therefor



March 15, 1960 J. I. BELLAMY ETAI. 2,928,903

swITcHING SYSTEM AND TRANsLAToR THEREFOR original Filed April 4, 1949 1asheets-sheet 1 II. v

March 15, 1960 .1.1. BELLAMY Erm. 2,928,903

SWITCHING SYSTEM AND TRANSLATOR THREFOR Original Filed April 4. 1949 18,Sheets-Sheet 2 March l5, 1960 J. l. BELLAMY ErAL 2,928,903

SWITCHING SYSTEM AND TRANSLATOR THEREFOR 18 SheetS-SheeI 3 OriginalFiledApril 4, 1949 March 15, 1960 J. l. BELLAMY ETAL 2,928,903

SWITCHING SYSTEM AND TRANSLATOR THEREFOR Original Filed April 4. 1949 18Sheets-Sheet 4 March 15, 1960 J. l. BELLAMY ETAL 2,928,903

swITcHING SYSTEM AND TRANsLAToR THEREFOR Original Filed April 4. 1949 18Sheets-Sheet 5 v N .mi

March 15, 1960 J. l. BELLAMY Erm. 2,928,903

SWITCHING SYSTEM AND TRASLATQR THEREFOR Original Filed April 4, 1949 18sheets-sheet 6 OEU J. l. BELLAMY ErAL 2,928,903

18 Sheets-Shee?l 7 Y SWITCHING SYSTEM AND TRANSLATOR THEREF'OR March 15,1960 Original Filed-April 4, 1949 v @E 20mm 5.-.

March 15, 1960 J. l. BELLAMY ETAL 2,928,903

SWITCHING SYSTEM AND TRANSLATOR THEREFOR Original Filed April 4. 1949 1asheets-sheet a M gu ONuw- March 15, 1960 .1.1. BELLAMY l-:TAL

swITcHING SYSTEM AND TRANsLAToR THEREFOR original Filed April 4, 1949 18sheets-sheet 9 March 15, 1960 J. 1. BELLAMY ETA. 2,928,903

SWITCHING SYSTEM AND TRANSLATOR THEREFOR -18 Sheets-Shee. l0

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March l5, 1960 J. l. BELLAMY ETAL 2,928,903

SWITCHING SYSTEM AND TRANSLATOR THEREFOR Original Filed April 4. 1949 18Sheeizs-Sheel 11 www.

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March 15, 1960 .1.1. BELLAMY EFAL SWITCHING SYSTEM AND TRANSLATORTHEREFOR Original Filed April 4, 1949 18 Sheets-Sheet 12 TR-AL STATIONSx5 7 1 I 1 il 2 2 2 2 2 2 2 y Z 2 |852 |853 |854 |855 |856 |857 |858|859 |85|O g l 3 i March 15, 1960 J. l. BELLAMY ETAL 2,928,903

SWITCHING SYSTEM AND TRANSLATOR THEREFOR Original Filed April 4. 1949 18Sheets-Sheet 13 TO/FROM LINE CONTROLLERS |200 March 15, 1960 J. l.BELLAMY ETAL 2,928903` swITcHING SYSTEM AND TRANSLATOR THEREFOR OriginalFiled April 4, 1949 1s sheets-sheet 14 aLocK TRANsLAToR soo(TERMINAL-PIN SECTION) DETECTOR FlELD H4 (OOO) DFI TOI FROM FIG. 3

March 15, 1960 J. BELLAMY ErAL 2,928,903

SWITCHING SYSTEM AND TRANSLATOR THEREFOR 18 Sheets-Sheet 15 OriginalFiled'April 4. 1949 FIG. 4 PART 2 March 15, 1960 .1.1. BELLAMY ETAL2,928,903

swITcT-TING SYSTEM AND TRANsLAToR THEREFOR Original Filed April 4, 194918 Sheets-Sheet 16 FIG. 4 PART 3 INTERCEPT I-IO .TO P WIRES OFUNEQUIPPED GROUPS `*IFRAME A FRAME B FRAME C FRAME D TO/FROM SLEEVEBUNCHING BLOCKS March 15, 1960 .1.1. BELLAMY ETAL 2,928,903

SWITCHING SYSTEM AND TRANSLATOR THEREFOR Original Filed April 4. 1949 18Sheets-SheeI 17 `ro/FRoM FIG. 3

RF| RF2 RESET FIELD |90 FRAME B FIG. 4

PART 4 Ma rch l5, 1960 J. l. BELLAMY ET AL 2,928,903

SWITCHING SYSTEM AND TRANSLATOR THEREFOR Original Filed April 4, 1949 18Sheets-Sheet 18 RFB FIG. 4 PART 5 United States Patent l SWITCHINGSYSTEM AND TRANSLATOR THEREFOR John I. Bellamy, Wheaton, Ill., andTheron L. Bowers,

Winnipeg, Manitoba, Canada, assignors, by mesne assignments, toInternational Telephone and Telegraph Corporation, a corporation ofMaryland Original application April 4, 1949, Serial No. 85,292, nowPatent No. 2,674,657, dated April 6, 1954. Divided and this applicationMarch 15, 1954, Serial No.

9 Claims. (Cl. 179-18) Column I. General Description 2 IA. The drawings3 II. General Operation (Fig. 1) 5 IIA. Local calls 5 IIB.Inter-exchange calls 7 III. Numbering and Translation Plan (Fig. 2)..- 7IV. Block Translator 1800 (Figs. 3 and 4) 8 IVA. Purpose and function 8IVAl. Call direction by normal fixed translation 8 IVAZ. Standardservices by overriding translation 8 IVB. Functional relay groups 9 IVC.Terminal-pin blocks 10 IVCl. The detector field 11 IVCZ. The commoniield 11 IVCZa. Common-number terminal groups 11 IVC2b. Number-transferterminal groups 11 IVCZc. Number -intercept terminal groups 11 IVC3. Thesleeve field 12 IVC3a. Spare levels in sleeve lield-- 12 IVC4. The resetfield 12 IVD. Operation for normal lixed translation- 13 IVDl. Settingup the dialed number in the translator 13 IVD2. Preliminary translation13 IVD3. Operation of the translator relays- 14 IVD3a. Fives translatorrelays 14 IVD3b. Twenty-lives translator. re-

lays 14 IVD3c. 250's translator relays 15 IVD4. Translated line numbers15 IVD4a. The translated primary digit (1 to 0)` 15 IVD4b. Thetranslated lives digit digit (l to 5) 16 IVD4c. The translated unitsdigit (l to 5) 17 IVD5. The called line is No. lll 17 IVDSa. Translatedprimary digit 5 for frame A 17 IVDSb. Translated lives digit 3 for FrameA 18 IVDSc. Translated units digit 2 for Frame A 18 IVD6.Line-controller response 18 IVD?. Clearing out 18 IVE. General operationfor overriding translation 18 IVEl. Detecting Specific line numbers-- 18IVF. Number-transfer service 19 IVFl. Transfer-relay assignment 2OIVFla. Detector jumper 1952----- 20 IVFlb. Reset jumper 1958...... 20

2,928,903 Patented Mar'.v 15, 1960 ice Column IVFZ. Number-transferoperation 2O IVFZa. Detection 20 IVF2b. Resetting 21 IVF2c.Line-controller response--- 2l' `IVF2d. Freeinga number-transfer relay2l IVG. Intercept service 22 IVGl. Intercept-relay assignment 22 IVGla.Detecting line number 959- 22 IVGlb. Line intercept for line 959-.. 22IVGlc. Station intercept for line 959 22 IVGld. Multi-station interceptservice 23 IVG 1e. More than three stations on intercept service 23IVGZ. Intercept call-in 23 IVG2a. Intercept-trunk sleeve wires 23 IVG2b.Setting the group allotter-- 24 IVG3. Overriding translation for firstincept trunk 24 IVG4. Using the second and third intercept trunks 24IVGS. Clearing out 24 IVG6. All intercept trunks busy 25 IVG7.Number-transfer and intercept service for the same line 25 IVI-I.Common-number service 25 IVHl. Making up a P.B.X group 26 IVHla. Usingten-trunk equipment P.B.X for group 000 26 IVHZ. Calling common-numbergroup IVI-12a. All common-number trunks busy 27 IVH3. Making upthree-trunk groups-- 27 IVH4. Making up six-trunk and ninetrunk groups27 IVI. Twenty-station code-ringing service 27 IVJI. Assigning a primaryswitch to twenty-station service 28 IVJZ. Twenty-station primarydetection- 28 IVJ3. Twenty-station fives detectiou.. 28 IVJ4.Station-intercept service for twenty station lines 29 IVK.Divided-ringing service 29 IVL. Control and supervision of digit wires29 This invention relates to a switching system and translator therefor.Its principal object is to provide a new and improved switching systemwherein the lines are terminated in non-decimal groups, together with anew and improved translator for translating called decimal line numbersinto non-decimal line-locational numbers suitable for controlling theextension of connections to called lines.

g I. GENERAL DESCRIPTION This application is a division of our priorapplication for a Primary-Secondary-Spread Crossbar Telephone System,Serial No. 85,292, tiled April 4, 1949, now Patent No. 2,674,657, issuedApril 6, 1954.

As disclosed in the noted parent application, common control apparatusis provided to receive dialed digit information for use in controllingthe extension of connections to called lines. Such common controlapparatus includes (1) a block controller for generally supervising theextension of connections, (2) a block translator for translating thedecimal digit information (hundreds, tens, and units) of the callednumber into non-decimal digit information (frame, primary, lives, andunits) identifying the physical location of the called line, and (3) anout! going controller for controlling the extension of connections tocalled outgoing trunkgroups.

A specific object of the invention is to provide a block translatorwhich is arranged and interconnected to normally effect a. fixeddecimal-to-non-decimal translation of the line digits of called linenumbers according to the normal physical location of any called line andwhich is further arranged to set aside the fixed translation, whenrequired, and substitute Van yoverriding translation therefor forextending a connectionto the line at a different location. Y

An important feature related to the last stated object is that theoutput conductors (primary, fives, and units) of the translator are usedin combination, thereby reducing the number of relays and relay contactsrequired in the translator.

A further vfeature is that the noted overriding translation operationpermits the continued use of line numbers assigned to lines terminatedat changed locations thereby enabling traffic unbalance among certainline primary switches to be corrected Without changing line numbers.Service according to this feature is referred to herein asnumber-transfer service.

Another -feature arising from the provision of the overridingtranslation operation resides in the arrangement providing commonvnumber(or P.B.X)l groups of lines as desired. The translator upon receivingthe called number assigned to a common-number group of lines, cancelsthe normal fixed translation; tests the lines in the common group;selects an idle one of the lines; and sets up an overriding translationnumber corresponding to the physical location of such selected line tocontrol the extension of the connection thereto. Service according tothis feature is referred to herein as common-number service.

A further feature using the overriding translation operation resides inan arrangement for providing intercept service whereby calls todisconnected'lines or disconnected stations on party lines are directedto an intercept operator. The translator responds to the calling of thenumber of a disconnected line or station by cancelling the normal fixedtranslation and substituting an overriding translation to route the callto an intercept operator. Service according to this feature is referredto as intercept service.

A further feature concerned with providing intercept service resides inVan arrangement whereby a group of equivalent intercept trunks isprovided and the overriding translation is varied to correspond to acurrently idle intercept trunk.

Other objects and features will appear as the description progresses.

. IA. The drawings The accompanying drawings, comprising Figs. 1 to 4disclose a preferred embodiment of the invention as follows:

Fig. lis a singleline block diagram of the apparatus employed inextending connections to and from lines and trunks and showing therelationship existing between the block translator and other apparatusof the disclosed switching system;

Fig. 2 (parts 1 to 4) shows the line-numbering plan of the switchingsystem embodying the invention and the translation plan for the blocktranslator;

Fig. 3 (parts 1 to 8) is a circuit diagram of the relay section of theblock translator; and

Fig. 4 (parts 1 to 5) is a circuit and wiring diagram ofthe pin-terminalsection of the block translator.

In Fig. l, the apparatus of exchange B includes the main distributingframe MDF., through which the subscriber lines and the trunks areinterconnected with the switchboard apparatus; four line-link frames A,B, C, and D, of which line-link frames A and B are shown at 250A and250B; a block-link frame shown .at 25; `and attuali-couplerA frameshown` 21.252.

In the chosen embodiment of the invention, each of the four line-linkframes A to D terminates 25() lines, providing a capacity of 1000 linesfor the exchange.

Considering line-linkframe A, for example, its function is to connectany calling one of the 250 subscriber lines which it serves with an idleone of a group of voriginating trunks, such as trunk 203A, and tointerconnect any of its terminating trunks, such as 207A, with anycalled one of the subscriber lines connected with the frame. For thispurpose line-linkY frame A is provided with a number of line-linkprimary switches 800A and a number of line-link secondary switches 900A.The subscriber lines Vare brought into the primary switches in themanner shown for calling line 200, which is brought in through jumper201 on the main distributing frame M.D.F. to its own individual verticallocation on linelink primary switch 800A.

The originating trunks extend from respective vertical locations on theline-link `secondary switches, such as is shown for originating trunk203A. The terminating trunks are connected to their own respectivevertical locations on the line-link secondary switches, such as is shownfor terminating trunk 207A.. The line-link primary and secondaryswitches are interconnected by 'a suitable number of line links, one of`which is shown at 202A.

The apparatus on `lineflink. frame A further includes line-controllerapparatus comprising line-controller switches .1000A and iltltlA, andlineA controller 1200A,

vwhich are shown in complete circuit diagram in Figs. l0,

1l, and 12 of our parent application. rIhe line-controller switches areilOllA and 1100A, and are interconnected with line controller l200A kbya group of control wires The general purpose of the notedline-controller apparatus is to controll the interconnection of lineswith trunks through switches 800A and 900A over two-way line links 202A.This general control resides primarily in line controller 1200A.

The purpose of the line-controller switches is to interconnect linecontroller 1260A with any concerned linelinkprimary switch such as 800Aover conductors such as 211A and 212A. Line-link frame B (shown at 250B)contains apparatus similar `to that of line-link frame A. rhecorrespondence is shown by employing the letter B as a sufhx for eachreference character applied at linelink frame B, whereas theletter A isused as a suiiix for each reference character appliedrat line-link frameA.

The purpose of the block-link frame, shown at 251, is to extendconnections received over yincoming trunks such as 2085, and overoriginating trunks such as 203A, to an idle outgoing trunksuch as 2020in a called group, or over an idle terminating trunk such as 207B to thelinelink frame terminating the called line. For this purpose, theblock-link frame is provided withV a number of blocklink primaryswitches such as y1300 and with a number of block-link secondaryswitches such as 1400, interconnected by block links 206.

The incoming and originating trunks such as 2085 and 263A are requiredtobe suitably coupled to the switchboard apparatus at the block-linkframe in order that the necessary digit information as to calldestination be recorded and acted upon. This general function isassigned to block couplers S00 individual to the respective incoming andoriginating trunks. incoming block coupler 50B-I is connectedindividually with incoming trunk 2085 b v jumper 204', while local blockcoupler 500-L is connected individually with originating trunkV 203Athrough jumper 204. Conductor sets 232 and 20S extend the incoming andoriginating trunks 2985 and 203A beyond the block couplers to respectivevertical locations on blocklink primary switches 1300. v

The outgoing and lterminating trunks (such as 2020 and 207B) extendfromrespective vertical locations on block-linlt-secondary switchesltll.

